Management of brinjal shoot and fruit borer, Leucinodes orbonalis Guenee in Kullu valley of Himachal Pradesh
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Date
2021-09-30
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Palampur
Abstract
The present study on “Management of brinjal shoot and fruit borer, Leucinodes orbonalis
Guenee in Kullu valley of Himachal Pradesh” was carried out during Kharif 2020 at Hill
Agricultural Research and Extension Centre (HAREC), Bajaura (1090m a s l) of Kullu
district. Traps were installed to find out peak emergence period of brinjal shoot and fruit borer
adult population and it was observed that the peak emergence period in light trap was from
29th to 34th standard meteorological week. On the other hand in pheromone trap the peak
emergence was from 28th to 31st standard meteorological week. Comparison between the
mean number of moths captured in light and pheromone trap revealed that the moths catch in
the former case was higher (9.59) than the latter case (3.54). The evening relative humidity
showed a significant positive correlation with the adult emergence in the light trap with
correlation coefficient of 0.781. Early transplanting of the brinjal crop resulted in the reduced
incidence of the L.orbonalis. The crop transplanted on 15th of May resulted in the lowest
mean shoot infestation (9.87 per cent), fruit infestation on number basis (9.66 per cent) as
well as on weight basis (8.83 per cent). On the other hand crop transplanted on 15th of June
resulted in highest mean shoot infestation (13.33 per cent), fruit infestation on number basis
(21.71 per cent) as well as on weight basis (19.91 per cent). A treatment consisting of lambdacyhalothrin 5EC @ 0.004% followed by quinalphos 25 EC @ 0.05% after 15 days of first
spray followed by lambda-cyhalothrin 5EC @ 0.004% after 15 days of second spray was
found to be the most effective with mean shoot infestation of 7.05 per cent and fruit
infestation of 8.41 per cent on number basis and 7.68 per cent on weight basis. This treatment
resulted in the highest marketable yield of 257.70 q/ha and was the most economic with the
highest net returns (12.61) per rupees invested